Your fluxgate compass may be affected by the magnetic field produced around the power-feed wires to the VHF. Since the magnetic field is proportional to the current flowing, you notice the problem only when transmitting (the vhf is drawing much more power). Check to see how close to the fluxgate the power wires to the VHF lead. Re-route the wires farther away, or if not possible, re-install the power wires after twisting them together along their whole length, especially near the compass. Installing twisted wire pairs in all electrical wiring near compases should be standard operating procedure. Mark Richter, M.E. Mark's Mobile Marine Currently in Beaufort, NC and northbound __________________________________________________ Do You Yahoo!? Kick off your party with Yahoo! Invites. http://invites.yahoo.com/